package com.rzl.expense.quartz.util;



import com.jcraft.jsch.*;
import org.springframework.stereotype.Component;

import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.util.Properties;
import java.util.Vector;

/**
 * SFTP工具类
 *
 */
@Component
public class SftpUtil {

    private ChannelSftp sftp;

    private Session session;
    /**
     * SFTP 登录用户名
     */
    private String username;
    /**
     * SFTP 登录密码
     */
    private String password;
    /**
     * 私钥
     */
    private String privateKey;
    /**
     * SFTP 服务器地址IP地址
     */
    private String host;
    /**
     * SFTP 端口
     */
    private int port;

    public ChannelSftp getSftp() {
        return sftp;
    }

    public void setSftp(ChannelSftp sftp) {
        this.sftp = sftp;
    }

    /**
     * 构造基于密码认证的sftp对象
     */
    public SftpUtil(String username, String password, String host, int port) {
        this.username = username;
        this.password = password;
        this.host = host;
        this.port = port;
    }

    /**
     * 构造基于秘钥认证的sftp对象
     */
    public SftpUtil(String username, String host, int port, String privateKey) {
        this.username = username;
        this.host = host;
        this.port = port;
        this.privateKey = privateKey;
    }

    public SftpUtil() {
    }

    @Override
    public String toString() {
        return "host:" + this.host + ",port:" + this.port + ",username:" + this.username + ",password:" + this.password + ",privateKey:" + privateKey;
    }


    /**
     * 连接sftp服务器
     */
    public void login() throws JSchException {
        JSch jsch = new JSch();
        if (privateKey != null) {
            // 设置私钥
            jsch.addIdentity(privateKey);
        }

        session = jsch.getSession(username, host, port);

        if (password != null) {
            session.setPassword(password);
        }
        Properties config = new Properties();
        config.put("StrictHostKeyChecking", "no");
        //TODO 移除kerberos验证方法
        config.put("PreferredAuthentications", "publickey,keyboard-interactive,password");

        session.setConfig(config);
        session.connect();

        Channel channel = session.openChannel("sftp");
        channel.connect();

        sftp = (ChannelSftp) channel;
    }

    /**
     * 关闭连接 server
     */
    public void logout() {
        if (sftp != null) {
            if (sftp.isConnected()) {
                sftp.disconnect();
            }
        }
        if (session != null) {
            if (session.isConnected()) {
                session.disconnect();
            }
        }
    }


    /**
     * 将输入流的数据上传到sftp作为文件。文件完整路径=basePath+directory
     *
     * @param path     上传到该目录
     * @param fileName sftp端文件名
     * @param input    输入流
     */
    public void upload(String path, String fileName, InputStream input) throws SftpException {
        try {
            sftp.cd("/home/"+path);
        } catch (SftpException e) {
            //目录不存在，则创建文件夹
            String[] dirs = path.split("/");
            for (String dir : dirs) {
                if (null == dir || "".equals(dir)) {
                    continue;
                }
                try {
                    sftp.cd(dir);
                } catch (SftpException ex) {
                    sftp.mkdir(dir);
                    sftp.cd(dir);
                }
            }
        }
        //上传文件
        sftp.put(input, fileName);
    }

    /**
     * 下载文件
     *
     * @param directory    下载目录
     * @param downloadFile 下载的文件
     * @param saveFile     存在本地的路径
     */
    public void download(String directory, String downloadFile, String saveFile) throws SftpException, FileNotFoundException {
        if (directory != null && !"".equals(directory)) {
            sftp.cd(directory);
        }
        File file = new File(saveFile);
        sftp.get(downloadFile, new FileOutputStream(file));
    }
    /**
     * 下载文件
     *
     * @param directory    下载目录
     * @param downloadFile 下载的文件
     * @param response
     */
    public void download(String directory, String downloadFile, HttpServletResponse response) throws SftpException, IOException {
        if (directory != null && !"".equals(directory)) {
            sftp.cd(directory);
        }
//        File file = new File(saveFile);
        sftp.get(downloadFile, response.getOutputStream());
    }


    /**
     * 下载文件
     *
     * @param srcSftpFilePath 文件源路径
     * @return 文件流
     * @throws SftpException 未获取到文件异常
     */
    public InputStream download(String srcSftpFilePath) throws SftpException {
        System.out.println(srcSftpFilePath);
        return sftp.get(srcSftpFilePath);
    }

    /**
     * 删除文件
     *
     * @param directory  要删除文件所在目录
     * @param deleteFile 要删除的文件
     */
    public void delete(String directory, String deleteFile) throws SftpException {
        sftp.cd(directory);
        sftp.rm(deleteFile);
    }

    /**
     * 列出目录下的文件
     *
     * @param directory 要列出的目录
     */
    public Vector<?> listFiles(String directory) throws SftpException {
        return sftp.ls(directory);
    }

    public long getFileSize(String srcSftpFilePath) {
        //文件大于等于0则存在
        long fileSize;
        try {
            SftpATTRS sftpATTRS = sftp.lstat(srcSftpFilePath);
            fileSize = sftpATTRS.getSize();
        } catch (Exception e) {
            //获取文件大小异常
            fileSize = -1;
            if ("no such file".equalsIgnoreCase(e.getMessage())) {
                //文件不存在
                fileSize = -2;
            }
            e.printStackTrace();
        }
        return fileSize;
    }
}


